After conquering fully two thirds of the map, with one Daimyo (Takeda) remaining, suddenly virtually ALL the provinces revolted! I had no religious differences and there was no reason for things to get 'Ikkei'. Also, a dead clan and daimyo came back to life!
Should I have left Shinobi in all my provinces?
Is this a 'bug' or is this the AI version of the 'Empire Strikes Back'?